Remove stl_util's STLDeleteContainerPairSecondPointers from ios/.

ios/net/cookies/cookie_store_ios.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef IOS_NET_COOKIES_COOKIE_STORE_IOS_H_
 #define IOS_NET_COOKIES_COOKIE_STORE_IOS_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 306 matching lines @@
 
   SetCookiesCallback WrapSetCallback(const SetCookiesCallback& callback);
   DeleteCallback WrapDeleteCallback(const DeleteCallback& callback);
   base::Closure WrapClosure(const base::Closure& callback);
 
   // Cached values of system cookies. Only cookies which have an observer added
   // with AddCallbackForCookie are kept in this cache.
   std::unique_ptr<CookieCache> cookie_cache_;
 
   // Callbacks for cookie changes installed by AddCallbackForCookie.
-  typedef std::map<std::pair<GURL, std::string>, CookieChangedCallbackList*>
-      CookieChangedHookMap;
-  CookieChangedHookMap hook_map_;
+  std::map<std::pair<GURL, std::string>,
+           std::unique_ptr<CookieChangedCallbackList>>
+      hook_map_;
 
   base::WeakPtrFactory<CookieStoreIOS> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CookieStoreIOS);
 };
 
 }  // namespace net
 
 #endif  // IOS_NET_COOKIES_COOKIE_STORE_IOS_H_